<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>双飞翼</title>
    <style>
    
    * {
        padding: 0;
        margin: 0;
    }


    .center {
        float: left;
        width: 100%;
        height: 100px;
        background: #f40;
    }

    .left {
        float: left;
        width: 200px;
        height: 100px;
        background: #096;
        margin-left: -100%;
    }

    .right {
        float: left;
        width: 200px;
        height: 100px;
        background: #369;
        margin-right: -200px;
    } 

    .mid {
        margin: 0 200px 0 200px;
        height: 100px;
        background: #222;
    }


    </style>
</head>
<body>
    <div class="container">
        <div class="center">
            <div class="mid">
                mid
            </div>
        </div>
        <div class="left">left</div>
        <div class="right">right</div>
    </div>

</body>
</html>